Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C257/00—Compounds containing carboxyl groups, the doubly-bound oxygen atom of a carboxyl group being replaced by a doubly-bound nitrogen atom, this nitrogen atom not being further bound to an oxygen atom, e.g. imino-ethers, amidines
  • C07C257/10—Compounds containing carboxyl groups, the doubly-bound oxygen atom of a carboxyl group being replaced by a doubly-bound nitrogen atom, this nitrogen atom not being further bound to an oxygen atom, e.g. imino-ethers, amidines with replacement of the other oxygen atom of the carboxyl group by nitrogen atoms, e.g. amidines
  • C07C257/22—Compounds containing carboxyl groups, the doubly-bound oxygen atom of a carboxyl group being replaced by a doubly-bound nitrogen atom, this nitrogen atom not being further bound to an oxygen atom, e.g. imino-ethers, amidines with replacement of the other oxygen atom of the carboxyl group by nitrogen atoms, e.g. amidines having nitrogen atoms of amidino groups further bound to nitrogen atoms, e.g. hydrazidines
• • A—HUMAN NECESSITIES
  • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
  • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
  • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
  • A01N43/64—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with three nitrogen atoms as the only ring hetero atoms
  • A01N43/647—Triazoles; Hydrogenated triazoles
  • A01N43/653—1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D249/00—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms
  • C07D249/02—Heterocyclic compounds containing five-membered rings having three nitrogen atoms as the only ring hetero atoms not condensed with other rings
  • C07D249/08—1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
  • C07D249/10—1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
  • C07D249/12—Oxygen or sulfur atoms

Definitions

• the present invention relates generally to the field of process chemistry as used in the preparation of commercially valuable chemical products.
• it pertains to processes related to 1 -aryltriazoiinone ring formation and to novel intermediates useful in these processes.
• the compound 4,5-dihy ⁇ ro-3-methyl-l-phenyl-l,2,4-triazol-5(lH)-one, among others, is a particularly useful 1 -aryltriazoiinone critical in the manufacture of commercially important herbicides.
• US Patents 4,818,275 and 5,125,958 fully describe conversions of 1 -aryltriazoiinone intermediates to known herbicides.
• I can be prepared in excellent yield and purity by (i) carbonylating an amidrazone of formula (A) with at least one carbonylating agent, or by (ii) condensing a hydrazonoyl derivative of formula (A) with at least one ring-forming agent, wherein formula (A) is
• W, X, Y, Z, and R are fully described below. Preferred are those where W is halogen or -NHR where R is hydrogen or haloalkyl; X and Y are independently selected from hydrogen, chloro, or fluoro; Z is hydrogen, bromo, iodo, nitro, amino, or methylsulfonylarnino; and R 1 is methyl. Additionally, certain compounds of formula (A) used to prepare 1-aryltriazolinones of formula I are also novel and are included among the preferred embodiments of the present invention.
• the "about” range shall be not more than 10% of the absolute value of an end point or 10% of the range recited, whichever is less.
• substituent terms "alkyl”, “alkoxy”, and “haloalkyl”, used alone or as part of a larger moiety includes straight or branched chains of at least one or two carbon atoms, as appropriate to the substituent, and preferably up to 12 carbon atoms, more preferably up to ten carbon atoms, most preferably up to seven carbon atoms.
• aryl refers to phenyl or naphthyl optionally substituted with one or more halogen, alkyl, alkoxy, or haloalkyl.
• Halogen or “halo” refers to fluorine, bromine, iodine, or chlorine.
• ambient temperature refers to a temperature in the range of about 20° C to about 30° C. Certain solvents, catalysts, and the like are known by their acronyms.
• DMAC N,N-dimethylacetamide
• DMF N,N-dimethylformamide
• T ⁇ F meaning terrahy ⁇ rofuran
• DMAP 4-dimethylaminopyridine
• DBN meaning l,5-diazabicyclo[4.3.0]non-5-ene
• DBU meaning 1,8- diazabicyclo[5.4.0]undec-7-ene.
• Glymes refers to a class of solvents comprised of monoglyme, diglyme, triglyme, tetraglyme, and polyglyme.
• GC refers to gas chromatography or gas chromatographic methods of analyses.
• amidrazone or “amidrazone of formula (A)” is synonymous with and refers to a 2-(optionally-substituted phenyl)hy ⁇ razidethaneimidic acid, for example, but not limited to 2-(2,4-dichlorophenyl)hydrazidethaneimidic acid.
• hydroazonoyl derivative or “hydrazonoyl derivative of formula (A)” is synonymous with and refers to a N-(optionally-substituted phenyl)ethanehydrazonoyl derivative, for example, but not limited to N-(2,4- dichlorophenyl)ethanehydrazonoyl chloride.
• compound or compounds of formula (A) refers to both amidrazone and hydrazonoyl derivatives.
• compound or compounds of formula I is synonymous with and refers to 1- aryltriazolinone(s), for example, but not limited to 4,5-dihydro-l-(2,4- dichlorophenyl 3-methyl- 1 ,2,4-triazol-5( 1 H)-one.
• amidrazone of formula (A) is carbonylated with at least one carbonylating agent, where formula (A) is:
• X and Y are independently selected from hydrogen, halogen, nitro, and amino; Z is selected from hydrogen, halogen, alkyl, alkoxy, nitro, amino, or alkylsulfonylamino; W is -NHR where R is hydrogen, alkyl, or haloalkyl; and, R is hydrogen, alkyl, haloalkyl, alkoxy, acetyl, or aryl.
• Preferred species of amidrazone (A) with which to conduct the carbonylation reaction of the present invention are selected from those wherein X and Y are independently selected from hydrogen, chloro, or fluoro; Z is hydrogen, bromo, iodo, nitro, amino, or methylsulfonylamino; R is hydrogen or difluoromethyl; and R 1 is C, to C 12 alkyl.
• amidrazone (A) More preferred species of amidrazone (A) are selected from those wherein X, Y, and R are hydrogen, Z is hydrogen, 5-nitro, or 5-amino, and R 1 is methyl, ethyl, or propyl; wherein X and R are hydrogen, Y is 4-chloro, Z is hydrogen or 5- nitro, and R l is methyl, ethyl, or propyl; wherein X is 2-chloro or 2-fluoro, Y, Z, and R are hydrogen, and R 1 is methyl, ethyl, or propyl; or wherein X is 2-chloro or 2-fluoro, Y is 4-chloro, Z is hydrogen, 5-bromo, 5-iodo, or 5-nitro, R is hydrogen, and R 1 is methyl, ethyl, or propyl. Most preferred species of amidrazone (A) are selected from those wherein
• X, Y, Z and R are hydrogen, and R 1 is methyl; or wherein X is 2-fluoro, Y is 4- chloro, Z and R are hydrogen, and R 1 is methyl.
• organic solvents both polar and apolar, useful in the process of the present invention include halogenated solvents, for example, such as, without limitation, chlorobenzene, carbon tetrachloride, bromodichloromethane, dibromochloromethane, bromoform, chloroform, bromochloromethane, butyl chloride, dichloromethane, tetrachloroethylene, trichloroethylene, 1,1,1-trichloro- ethane, 1,1,2-trichloroethane, 1,1-dichloroethane, 2-chloropropane, hexafluorobenzene, 1,2,4-trichlorobenzene, 1 ,2-dichlorobenzene, fluorobenzene and other halogenated solvents known in the art.
• halogenated solvents for example, such as, without limitation, chlorobenzene, carbon tetrachloride, bromodichloromethane, dibrom
• Preferred polar organic solvents include ethers, for example, such as, without limitation, dimethoxymethane, THF, 1,3-dioxane, 1,4-dioxane, furan, diethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl ether, tert. -butyl ethyl ether, tert. -butyl methyl ether and other ether solvents known in the art.
• ethers for example, such as, without limitation, dimethoxymethane, THF, 1,3-dioxane, 1,4-dioxane, furan, diethyl ether, ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol diethyl ether, triethylene glycol dimethyl
• polar organic solvents useful in the context of the present invention include, for example, without limitation, propionitrile, ethyl formate, methyl acetate, hexachloroacetone, acetone, ethyl methyl ketone, ethyl acetate, nitromethane, nitrobenzene, glymes, and other polar solvents known in the art.
• organic solvents useful herein include polar aprotic solvents, for example, such as, without limitation, DMF, DMAC, l,3-dimethyl-3,4,5,6- tetrahyciro-2(ll ⁇ -pyrimidinone, l,3-dimethyl-2-imidazolidinone, N- methylpyrrolidinone, formamide,, N-methylacetamide, N-methylformamide, acetonitrile, dimethyl sulfoxide, sulfolane, N,N-dimethylpropionamide, tetramethylurea, hexamethylphosphoramide and other polar aprotic solvents known in the art.
• polar aprotic solvents for example, such as, without limitation, DMF, DMAC, l,3-dimethyl-3,4,5,6- tetrahyciro-2(ll ⁇ -pyrimidinone, l,3-dimethyl-2-imidazolidinone, N- methylpyrrolidinone
• organic solvents useful for implementation of the present invention include protic solvents, for example, such as, without limitation, water, methanol, ethanol, 2-nitroethanol, 2-fluoroethanol, 2,2,2-trifluoroethanol, ethylene glycol, 1-propanol, 2-propanol, 2-methoxyethanol, 1-butanol, 2-butanol, isobutanol, ter t.-butanol, 2-ethoxyethanol, diethylene glycol, 1-, 2-, or 3-pentanol, 2,2-dimethyl-l-propanol, tert.-pentanol, cyclohexanol, anisole, benzyl alcohol, glycerol and other protic solvents known in the art.
• protic solvents for example, such as, without limitation, water, methanol, ethanol, 2-nitroethanol, 2-fluoroethanol, 2,2,2-trifluoroethanol, ethylene glycol, 1-propanol, 2-propanol, 2-methoxyethanol, 1-
• organic solvents useful in the present invention include: acidic solvents, for example, such as, without limitation, trifluoroacetic acid, acetic acid, formic acid and other acidic solvents known in the art; basic solvents, for example, such as, without limitation, 2-, 3-, or 4-picoline, pyrrole, pyrrolidine, morpholine, pyridine, piperidine, triethylamine and other basic solvents known in the art; and hydrocarbon solvents, for example, such as, without limitation, benzene, cyclohexane, pentane, hexane, toluene, cycloheptane, methylcyclohexane, heptane, ethylbenzene, ortho-, meta-, or ⁇ r ⁇ -xylene, octane, indane, nonane, naphthaline and other hydrocarbon solvents known in the art.
• acidic solvents for example, such as, without limitation, triflu
• Organic solvents most suitable for conducting the carbonylation of amidrazone (A) are those that are low cost, best enhance the solubility of the starting materials to promote rate of reaction, and offer n inimum solvent decomposition. Accordingly, preferred organic solvents include DMF, DMAC, acetonitrile, toluene, THF, and glymes. More preferred solvents include acetonitrile, toluene, tetrahydrofuran, monoglyme, and diglyme. The most preferred organic solvent in which to conduct the carbonylation of amidrazone (A) is toluene.
• a useful ratio of solvent to amidrazone (A) to afford optimum reaction conditions is in the range of about 2.5/1 to about 20/1 wt/wt, preferably about 3/1 to about 15/1.
• an amidrazone of formula (A) is carbonylated with at least one carbonylating agent.
• Useful carbonylating agents are represented by the following formula:
• R 2 and R 3 are the same and are selected from the group consisting of halogen, alkoxy, dichloromethoxy, trichloromethoxy, imidazol-1-yl, 2- methylimidazol-1-yl, phenoxy or naphthoxy wherein phenoxy and naphthoxy are optionally substituted with halogen, alkoxy, or nitro; or wherein R 2 and R 3 are different where, for example, R 2 is halo, and R 3 is alkoxy; provided that if the carbonylating agent is selected wherein R 2 and R 3 are chloro, at least one other carbonylating agent is also selected.
• Preferred carbonylating agents are those wherein R 2 and R 3 are the same and are selected from the group consisting of dichloromethoxy, trichloromethoxy, imidazol-1-yl, or phenoxy optionally substituted with halogen, alkoxy, or nitro.
• a more preferred carbonylating agent with which to carbonylate amidrazone (A) is that wherein R 2 and R 3 are each phenoxy.
• a preferred mole ratio of carbonylating agent to amidrazone (A) is in the range of about 1/1 to about 2.5/1, more preferably about 1.1/1 to about 1.5/1.
• the carbonylation of an amidrazone of formula (A) to form a compound of formula I is conducted in the presence of an acid or base catalyst.
• the catalyst need not be present in order to form a compound of formula I; however, its presence will generally accelerate the formation of a compound of formula I. Whether or not a catalyst is preferably present may depend upon the compound of formula I being formed, the amidrazone (A) being used as the reactant, the catalyst, the desired reaction time, and the reaction temperature, which one of ordinary skill in the art can readily determine based on general knowledge and this disclosure.
• An acid catalyst useful in the context of the present invention can be a protic (Brontsted) acid or an electron pair-accepting (Lewis) acid. Acid catalysts include, for example, mineral, organic, inorganic, and organometallic acids.
• Preferred acid catalysts include, but are not limited to, hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, perchloric acid, acetic acid, trifluoroacetic acid, trifluoromethanesulfonic acid, chlorosulfonic acid, methanesulfonic acid, /? ⁇ r ⁇ -toluenesulfonic acid, camphorsulfonic acid, benzenesulfonic acid, boron trifluoride, boron trifluoride etherate, aluminium chloride, zinc chloride, and lanthanum series trifluoromethanesulfonates such as the trifluoromethanesulfonates of scandium, praseodymium, and ytterbium, and other acid catalysts known in the art.
• Preferred acid catalysts for use in carbonylating an amidrazone of formula (A) include, but are not limited to, boron trifluoride, aluminum chloride, lanthanum series trifluoromethanesulfonates, methanesulfonic acid, p ⁇ r ⁇ -touluenesulfonic acid, acetic acid, and trifluoroacetic acid.
• Particularly preferred acid catalysts include boron trifluoride, scandium trifluoromethanesulfonate, methanesulfonic acid, and/ ⁇ /r ⁇ -touluenesulfonic acid.
• the acid catalyst is present in a mole ratio of acid catalyst to amidrazone (A) in a range of about 0.0001/1 to about 1/1, preferably in a range of about 0.001/1 to about 0.1/1. Additional amounts of acid catalyst can be added if necessary to drive the reaction faster, for example.
• Preferred base catalysts include, but are not limited to, alkali metal, alkaline earth metal, and transition metal halides, hydrides, hydroxides, bicarbonates, carbonates, and the like.
• Metd halides useful in the present context include, but are not limited to, lithium chloride, lithium fluoride, lithium bromide, lithium iodide, sodium chloride, sodium fluoride, sodium bromide, sodium iodide, potassium chloride, potassium fluoride, potassium bromide, potassium iodide, magnesium chloride, magnesium fluoride, magnesium bromide, magnesium iodide, calcium chloride, calcium fluoride, calcium bromide, calcium iodide, silver bromide, and silver iodide.
• Metal hydrides useful in the present context include, but are not limited to, lithium hydride, sodium hydride, potassium hydride, magnesium hydride, calcium hydride, and barium hydride.
• Metal hydroxides useful in the present context include, but are not limited to, lithium hydroxide, sodium hydroxide, potassium hydroxide, magnesium hydroxide, calcium hydroxide, and barium hydroxide.
• Metal bicarbonates useful in the present context include, but are not limited to, sodium bicarbonate, and potassium bicarbonate.
• Metal carbonates useful in the present context include, but are not limited to, sodium carbonate and potassium carbonate.
• One of ordinary skill upon receipt of the teachings hereof, may select other alkali metal, alkaline earth metal, and transition metal halides, hydrides, hydroxides, bicarbonates, and carbonates known in the art as catalysts.
• Useful base catalysts also include alkali metal alkoxides, such as, without limitation, sodium methoxide, sodium ethoxide, potassium methoxide, potassium ethoxide, potassium tert.-butoxide, and other alkali metal alkoxides known in the art.
• alkali metal alkoxides such as, without limitation, sodium methoxide, sodium ethoxide, potassium methoxide, potassium ethoxide, potassium tert.-butoxide, and other alkali metal alkoxides known in the art.
• Other useful base catalysts include organic alkyl amines and cyclic amines, for example, but are not limited to methylamine, ethylamine, dimethylamine, diethylamine, trimethylamine, triethylamine, ethyldiisopropylamine, butylamine, pyridine, DMAP, 2,6-dimethylpyridine, piperidine, piperazine, morpholine, quinoline, DBN, DBU, and other alkyl amines and cyclic amines known in the art.
• Preferred base catalysts for use in carbonylating an amidrazone of formula (A) include sodium carbonate, potassium carbonate, sodium hydride, triethylamine, pyridine, DMAP, DBN, DBU, sodium methoxide, potassium methoxide, and potassium fert-butoxide.
• Particularly preferred base catalysts include sodium carbonate, potassium carbonate, DMAP, DBN, and DBU.
• the base catalyst used in the present invention can be present in a mole ratio of base catalyst to amidrazone (A) in a range of about 0.0001/1 to about 1/1, preferably in a range of about 0.001/1 to about 0.1/1. Additional amounts of base catalyst may be added if necessary to drive the reaction faster, for example.
• the temperature at which and the period for which a chemical reaction such as the carbonylation of amidrazone (A) is conducted will vary according to, among other things, the solvent or solvents in which the reaction is conducted, the reaction format (e.g., batch, semi-batch, or continuous), the carbonylating agent, and/or the formula of amidrazone (A), and whether or not a catalyst is used.
• the carbonylation of amidrazone (A) as set forth herein is generally conducted at a temperature in the range of about 10° C to about 200° C for a period of time of up to about 20 hours, preferably in the range of about ambient temperature to about 160° C for about 10 hours, and more preferably up to about 5 hours.
• a hydrazine derivative for example, 2,4-dichlorophenylhydrazine (1) is first prepared from its hydrochloride salt by treating the salt with a base, such as aqueous sodium hydroxide, giving the free hydrazine (1).
• the free hydrazine (1) is in turn reacted with, for example, ethyl acetimidate at a temperature of about 0° C to about ambient temperature in an appropriate solvent such as methylene chloride, yielding the corresponding amidrazone (A), 2,4-dichlorophenylhydrazidethaneimidic acid.
• Amidrazone (A) is in turn carbonylated with, for example, diphenyl carbonate at a temperature of about 100° C to about 115° C in a appropriate solvent such as toluene, yielding the corresponding compound of formula (I), 45-dihydro-l-(2,4- dichlorophenyl)-3-methyl-l,2,4-triazol-5(lH)-one.
• the carbonylation of amidrazone (A) to the compound of formula (I) is routinely aided with a catalyst, such as DMAP.
• a catalyst such as DMAP
• I involves a condensation reaction of a hydrazonoyl derivative of formula (A) with at least one ring-forming agent, where formula (A) is:
• X and Y are independently selected from hydrogen, halogen, nitro, and amino;
• Z is selected from hydrogen, halogen, alkyl, alkoxy, nitro, amino, or alkylsulfonylamino;
• W is halogen, -NCO, -OSO 2 CH 3 , -OSO 2 CF 3 , or
• R 1 is hydrogen, alkyl, haloalkyl, alkoxy, acetyl, or aryl.
• Preferred species of hydrazonoyl derivative (A) with which to conduct the condensation reaction of the present invention are selected from those wherein W is halogen; X and Y are independently selected from hydrogen, chloro, or fluoro; Z is hydrogen, bromo, iodo, nitro, amino, or methylsulfonylamino; and R 1 is C, to
• More preferred species of hydrazonoyl derivative (A) are selected from those wherein W is chloro; X and Y are hydrogen; Z is hydrogen, 5-nitro, or 5- amino; and R is methyl, ethyl, or propyl; wherein W is chloro; X is hydrogen; Y is 4-chloro; Z is hydrogen or 5-nitro; and R 1 is methyl, ethyl, or propyl; wherein W is chloro; X is 2-chloro or 2-fluoro; Y and Z are hydrogen; and R 1 is methyl, ethyl, or propyl; or wherein W is chloro: X is 2-chloro or 2-fluoro, Y is 4-chloro; Z is hydrogen 5-bromo, 5-iodo, or 5-nitro; and R 1 is methyl, ethyl, or propyl.
• hydrazonoyl derivative (A) are selected from those wherein W is chloro; X, Y, and Z are hydrogen; and R 1 is methyl, or wherein W is chloro; X is 2-fluoro; Y is 4-chloro, Z is hydrogen, and R' is methyl.
• At least one organic solvent such as those described above, is preferably employed.
• Preferred organic solvents are those that are low cost, best enhance the solubility of the starting materials to promote rate of reaction, and offer minimum solvent decomposition. Accordingly, preferred organic solvents include glymes, DMF, DMAC, l-methyl-2-pyrrolidinone, and methyl sulfoxide. More preferred solvents are glymes, DMF, and DMAC. Particularly preferred solvents are DMAC and diglyme.
• a useful ratio of solvent to hydrozonoyl derivative (A) to afford optimum reaction conditions is in the range of about 2.5/1 to about 20/1 wt/wt, preferably about 3/1 to about 15/1.
• reaction rate-promoting amount of water is in the range of about 0.001/1 to about 1/1 wt/wt.
• a preferred ratio is about 0.01/1 to about 0.9/1, more preferably about 0.04/1 to about 0.8/1.
• a hydrazonoyl derivative of formula (A) is condensed with at least one rmg-forming agent.
• Useful ring- forming agents in the process of the present invention include, for example, such as, without limitation sodium cyanate, potasium cyanate, silver cyanate, methyl carbamate, ethyl carbamate, phenyl carbamate, cyanic acid, isocyanic acid, acetyl isocyanate, and trimethylsilyl isocyanate.
• Preferred ring-forming agents are sodium cyanate, potassium cyanate, cyanic acid, isocyanic acid, and phenyl carbamate.
• More preferred rmg-forming agents are sodium cyanate and potassium cyanate, particularly potassium cyanate.
• the condensation reaction of a hydrazonoyl derivative of formula (A) to form a compound of formula I is conducted in the presence of a catalyst.
• useful catalysts for condensing hydrazonoyl derivative (A) include potassium iodide, potassium fluoride, silver bromide, silver iodide, and elemental iodine.
• Preferred catalysts are potassium iodide, potassium fluoride, and elemental iodine, particularly potassium fluoride.
• the catalyst used in the present invention can be present in a mole ratio of catalyst to hydrazonoyl derivative (A) in a range of about 0.001/1 to about 0.1/1, preferably about 0.004/1 to about 0.06/1. Additional amounts of catalyst may be added if necessary to drive the reaction faster, for example.
• the temperature at which and the period for which a chemical reaction such as the condensation reaction of a hydrazonoyl derivative of formula (A) is conducted will vary, as discussed above.
• the condensing of hydrazonoyl derivative (A) as set forth herein is generally conducted at a temperature in the range of about -10° C to about 160° C for a period of time up to about 30 hours, preferably in the range of about 0° C to about 100° C for up to about 20 hours, more preferably up to about 10 hours.
• the free hydrazine (1) as described above for example, 2,4-dichlorophenylhydrazine (1) is reacted with acetic anhydride at a temperature of about 10° C in an appropriate solvent such as ethyl acetate, yielding the corresponding l-acetyl-2-(2,4-dichlorophenyl)hydrazine (2).
• the hydrazine (2) is then chlorinated with phosphorous oxychloride at a temperature of about 110° C in an appropriate solvent such as toluene, yielding the hydrazonoyl derivative of formula (A), N-(2,4-dichlorophenyl)ethanehydrozonoyl chloride.
• the hydrozonoyl chloride (A) is condensed with a ring forming agent, for example, potassium cyanate at a temperature of about 40° C to about 65° C in an appropriate solvent such as DMAC, yielding the corresponding compound of formula (I), 45-dihydro- l-(2,4-dichlorophenyl)-3-methyl-l,2,4-triazol-5(lH)-one.
• the hyrazonoyl derivative (A) for example, N-(2,4-dichlorophenyl)ethanehydrozonoyl chloride is conducted at ambient temperature in the solvent diglyme in the presence of a catalytic amount of water.
• a detailed procedure for the preparation, and the water-catalized condensing of the hydrozonoyl chloride (A) with the ring forming agent potassium cyanate in diglyme to yield a compound of formula (I) is set forth in Example 2 hereinbelow.
• a third embodiment of the present invention relates to novel amidrazone and hydrazonoyl derivatives of formula (A) useful in the preparation of compounds of formula I. These compounds are represented by formula (A): 15
• W is halogen, -NCO, -OSO 2 CH 3 , -OSO 2 CF 3 , -OSO 2 (p-CH 3 Ph); or -NHR where R is hydrogen, alkyl, or haloalkyl; X and Y are independently selected from hydrogen, halogen, nitro, and amino; Z is selected from hydrogen, halogen, alkyl, alkoxy, nitro, amino, or alkylsulfonylamino; and, R 1 is hydrogen, alkyl, haloalkyl, alkoxy, acetyl, or aryl.
• Preferred novel compounds of formula (A) are those wherein W is halogen or -NHR where R is hydrogen or difluoromethyl; X and Y are independently selected from hydrogen, chloro, or fluoro; Z is hydrogen, bromo, iodo, nitro, amino, or methylsulfonylamino; and R 1 is C, to C, 2 alkyl.
• More preferred novel compounds of formula (A) are those wherein W is chloro or -NHR where R is hydrogen; X and Y are hydrogen; Z is hydrogen, 5- nitro, or 5-amino; and R 1 is methyl, ethyl, or propyl; those wherein W is chloro or -
• R 1 is methyl, ethyl, or propyl.
• R is hydrogen, X, Y, and Z are hydrogen, and R 1 is methyl; or wherein W is chloro or -NHR where R is hydrogen, X is 2-fluoro, Y is 4-chloro, Z is hydrogen, and R 1 is methyl.
• This example illustrates a process for preparing 4,5-dihydro-l-(2,4- dichlorophenyl)-3-methyl-l,2,4-triazol-5(lH)-one (I) from N-(2,4- dichlorophenyl)ethanehydrazonoyl chloride (A) in DMAC solvent
• reaction mixture was stirred for 30 minutes during which time the reaction mixture temperature fell to about 45 °C. GC analysis of the reaction mixture after this time indicated that the reaction was complete.
• the reaction mixture was concentrated under reduced pressure to a residue. The residue was slurried with about 100 grams of water, and the resultant solid was collected by filtration. The solid was washed with water and dried, yielding 21.2 grams of subject compound (I) (yield from (2) was 77.3%; yield from (A) was 96.8%).
• This example illustrates a process for preparing 4,5-dihydro-l-(2,4- dichlorophenyl)-3-methyl-l,2,4-triazol-5(lH)-one (I) from N-(2,4- dichlorophenyl)ethanehydrazonoyl chloride (A) in diglyme solvent
• a solution of 5.1 grams (0.0214 mole) of N-(2,4-dichlorophenyl)ethane- hydrazonoyl chloride (A), prepared as in Example 1, 2.1 grams (0.0257 mole) potassium cyanate, and 3 mL of water in 51 mL of diglyme was stirred at ambient temperature for about 22 hours.
• reaction mixture was concentrated under reduced pressure to a residue.
• the residue was dissolved in about 500 mL of ethyl acetate and washed with three 25 mL portions of water. The organic layer was dried with magnesium sulfate and filtered. The filtrate was concentrated under reduced pressure to a residue. The residue was triturated with hexane and the resultant solid was collected by filtration. The solid was dried, yielding 4.5 grams (85.2% yield from (A)) of subject compound Q).
• This example illustrates a process for preparing 4,5-dihydro-l-(2,4- dichlorophenyl)-3-methyl-l,2,4-triazol-5(lH)-one (I) from 2-(2,4- (hcUorophenyl)hydrazidethaneimidic acid (A)

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• 2000
  • 2000-09-18 US US09/663,336 patent/US6492527B1/en not_active Expired - Fee Related
  • 2000-10-05 TW TW089120717A patent/TWI289140B/zh not_active IP Right Cessation
  • 2000-10-12 WO PCT/US2000/028240 patent/WO2001027092A2/en active IP Right Grant
  • 2000-10-12 ES ES00972109T patent/ES2267577T3/es not_active Expired - Lifetime
  • 2000-10-12 AT AT00972109T patent/ATE332293T1/de not_active IP Right Cessation
  • 2000-10-12 AU AU10818/01A patent/AU784318B2/en not_active Expired
  • 2000-10-12 IL IL14906300A patent/IL149063A0/xx active IP Right Grant
  • 2000-10-12 PL PL00364879A patent/PL364879A1/xx not_active Application Discontinuation
  • 2000-10-12 DE DE60029245T patent/DE60029245T2/de not_active Expired - Fee Related
  • 2000-10-12 DK DK00972109T patent/DK1240149T3/da active
  • 2000-10-12 JP JP2001530112A patent/JP4954409B2/ja not_active Expired - Lifetime
  • 2000-10-12 KR KR1020027004352A patent/KR100722041B1/ko active IP Right Grant
  • 2000-10-12 CZ CZ2002-1240A patent/CZ304209B6/cs not_active IP Right Cessation
  • 2000-10-12 BR BRPI0014561-0A patent/BR0014561B1/pt not_active IP Right Cessation
  • 2000-10-12 CN CNB008141355A patent/CN100349879C/zh not_active Expired - Fee Related
  • 2000-10-12 HU HU0203543A patent/HU228358B1/hu not_active IP Right Cessation
  • 2000-10-12 PT PT00972109T patent/PT1240149E/pt unknown
  • 2000-10-12 EP EP00972109A patent/EP1240149B1/en not_active Expired - Lifetime
• 2002
  • 2002-04-09 IL IL149063A patent/IL149063A/en not_active IP Right Cessation
  • 2002-09-18 US US10/246,571 patent/US6600049B2/en not_active Expired - Fee Related
• 2003
  • 2003-01-13 US US10/341,012 patent/US6992221B2/en not_active Expired - Lifetime
• 2006
  • 2006-10-04 CY CY20061101428T patent/CY1106186T1/el unknown

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